Respiration is the process by which the energy of the food is made availabe to the cells. The respiratory organs are lungs, gills, skin, etc. This note provide information about various types of respiration. In this note, we also discuss about the respiration in human body.
The process of removing waste materials like urea, uric acid, carbon dioxide, etc from our body is called excretion. Digestion can be defined as the process of mechanical and chemical breakdown of ingested complex food into simpler ones. This note provides information about excretion and digestive system in living organisms.